As a working Jazz guitarist, I like to keep things interesting for me and the audience. After a great experience with Thomastik-Infeld Flat Wound strings -- I decided to try the Round Wound Be-Bop. What a change up from my regular sound and an exciting change from the mellow Flat Wounds. Oh, I can still throw some Bass on the Tone Control and stay in mellow city, but it's a bright mellow -- where each note has a clear voice. After 25 years of playing, I never realized what a difference a string can make. I don't know what Thomastik-Infeld does that is so radical -- but I would highly recommend that you try a set and experience this for yourself. I wish that I had known about Thomastik-Infeld strings much sooner. Cheers, Rooster